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Wikipedia
The Y chromosome is one of the sex-determining chromosomes in humans and most other mammals. In mammals, it contains the gene SRY, which triggers testis development, thus determining maleness.
Overview
Most mammals have one pair of sex chromosomes...
http://en.wikipedia.org/wiki/Y_chromosome
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Links
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Blogs
http://blog.tanyakhovanova.com/?pu003d40Fraternal Birth Order Threatens Research into the Genetics of ... (by: Tanya Khovanova)
The research into a genetic component of gayness shows that there might be some genes in the X chromosome that influence male homosexuality. It also shows that the same genes might be responsible for increased fertility in females. ...
http://hiiroki.wordpress.com/2008/07/19/genomics-newsletter-from-biocompare-july-19-2008/Genomics Newsletter from Biocompare (July 19 2008) (by: hiiroki)
Courtesy of Biocompare. News ‘Smothered’ Genes Combine with Mutations to Yield Poor Outcome in Cancer Patients more… Y Chromosome Study Sheds Light on Athapaskan Migration to Southwest US more… The Epigenetics of Increasing Weight ...
http://traditional4fun.blogspot.com/2008/07/huntingtons-disease-information.htmlHuntingtonu0026#39;s Disease Information (by: doudie)
Each half of a chromosome pair is similar to the other, except for one pair, which determines the sex of the individual. This pair has two X chromosomes in females and one X and one Y chromosome in males. The gene that produces HD lies ...
http://traditional4fun.blogspot.com/2008/07/hemophilia-disease-information.htmlHemophilia Disease Information (by: doudie)
The genes for hemophilia A and B are on the X chromosome. The chromosomes that determine a person’s sex are called X and Y. Men have an X and a Y chromosome and women have two X chromosomes. Since men have only one X chromosome, ...
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Definition
No definitions found for y chromosome genes.
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Questions & Answers
Why is it that-- although there are very few genes located on the Y chromosome --?
human males may suffer from having just one copy of the X chromosome, while females have two?
This part is really confusing to me so please answer and explain... Thank you!
I'll start with an eg. Haemophilia A is an X linked disorder. So this disorder is found on X chromosome we'll call it X^ .
A Normal X is called X*.
A normal male has X*Y
and a
normal female has X*X*....
So if a male inherited the abnormal X^ they would have X^Y.
So they will be affected 100%. Because they only have 1 X chr.
On the other hand chicks, have 2 X Chromosome's.... So if she had X^X*. The normal X* will overide the abnormal X^. She will only Express the X*.
So she wont be affected. But will be a carrier, and possibly pass it on to 50% of either of her children.(males will be affected, females carriers, if she marrys a normal male)
Hope i made sense.
Just how useful is the Y chromosome as a population tracking gene?
It's generally assumed that Y chromosome Adam existed prior to the human expansion out of Africa. But if this quote from an article I read is true, are we only tracking the expansion of a superior mutation, not a population movement?
"The Y chromosome was once thought to be devoid of genetic information. However, recent work shows that it contains numerous genes related to sperm production and dimorphic traits (such as body size and tooth development). Among mammals, these traits influence a male's competitive ability in male–male contests and in sperm competition. Therefore, sexual selection could have favoured genes on the Y chromosome that enhance male fertilization success because they spread unaltered through the male line. "
http://cas.bellarmine.edu/tietjen/Ecology/y_chromosome_as_a_battle_ground_.htm
Also, 100k skull found in Henan,China.
http://anthropology.net/2008/01/22/100000-year-old-human-skull-found-in-henan-china/
Yet they still quote Lewontins work, even though it was published in 1970 Rshampsh. We could easily be chasing a Y chromosome that spread just because it produced more motile sperm.
http://www.ingentaconnect.com/content/repro/rebi/2003/00000007/00000001/art00005
http://cat.inist.fr/?aModele=afficheN&cpsidt=979421
I get how it works Willing Thinker, it's the neutrality of the chromosome I'm disputing. If you decided to study the European gene for lactose distribtion, you could come to the conclusion that our population all originated from some point near the Black Sea, 8k years ago.
Since the bulk of our specie's mutations are African, we can't really dispute that they contributed most of our ancestry, it's just using one or two bit's of non neutral DNA as irrefutable proof that there were no minority contributors from outside Africa that grates. Also use it to date the expansion is ridiculous. Really, they need to pick a bunch of proven neutral gene markers to study, and run them through a good computer simulation to find the best scenario.
Blakker than thou, they've found X chromosomes in Europe and Asia that don't came from Africa, and they estimate the seperation to be ANCIENT.
The truth is human populations migrate. It is impossible to tell (unless you have actual fossils with DNA I suppose) where the traits came from. You could map the genes on a map and still the degree of uncertainty would still be high. A superior mutation could move independent of actual tribal movements also. It might spread like a wild fire accross a population over thousands of years. I am skeptical of those that claim to be able to track it. It seems more likely they are simply paying homage to the Out of Africa Theory that seems to be a requirement in some circles of anthropology.
what genes are found in the Y chromosome?
the swine sex-determining gene on the Y chromosome
Y chromosome are the genes to make a man---it is found together with an X chromosome, most in normal men. It is known that it contains at least 20 genes, unique in determining gene and male fitness gene, only active in the testis and are responsible in the formation of sperm.
Among the genes in Y chromosomes are :-
-acetylserotonin methyltransferase
-testis-specific protein
-protein kinase
-amelogenin
-interleukin-3
-azoospermia
The gene on the Y chromosome is normally passed from a father to his son, since it can only be transmitted by a man to his male progeny...
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